Depth is an essential piece of the puzzle for success in fantasy baseball.
Lou Brown said in Major League, "over 162 games, even tough guys get strains." Being able to accommodate your roster during those stints when your stars need time off or get injured, having high-end talent to fill in is going to make you finish the season as a champion.
Fantasy drafts should be thought of as two distinct parts. The first part is all about adding superstars and solid regulars who provide stability to your roster. The second part is taking chances on talented players who have yet to prove themselves in MLB or have struggled to stay healthy to put everything together.